FileBrowser tries to find icons that do not exist, e.g. in /user/output/ directory

When opening the /user/output/ directory in the file browser, I get a lot of 404 errors. Seems that the FileBrowser automatically tries to find a png icon named as the extension of the file.

HEAD http://localhost:4282/static/img/icons/file/batchJob.png

404 Not Found
66ms
dojo.j…7365.54 (line 18)
“NetworkError: 404 Not Found - http://localhost:4282/static/img/icons/file/batchJob.png”
batchJob.png
HEAD http://localhost:4282/static/img/icons/file/err.png

404 Not Found
92ms
dojo.j…7365.54 (line 18)
“NetworkError: 404 Not Found - http://localhost:4282/static/img/icons/file/err.png”
err.png
HEAD http://localhost:4282/static/img/icons/file/out.png

404 Not Found
78ms
dojo.j…7365.54 (line 18)
“NetworkError: 404 Not Found - http://localhost:4282/static/img/icons/file/out.png”
out.png
HEAD http://localhost:4282/static/img/icons/file/sh.png

404 Not Found
87ms
dojo.j…7365.54 (line 18)
“NetworkError: 404 Not Found - http://localhost:4282/static/img/icons/file/sh.png”

(from redmine: issue id 1228, created on 2012-10-19 by root, closed on 2012-11-16)